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Design D
Main Design Objectives
Low cost, loose accuracy
High absolute accuracy and precision
One-time calibrated, low drift
Low voltage, battery powered, moderate accuracy
Example Application
Consumer audio device
Lab instrument
Digital offset and gain adjustment
Portable instrument
DAC Calibration
None
Annual (gain and offset)
One-time factory (gain and offset)
None
Maximum Error Target
16LSB @ 10 bits (6-bit accuracy)
2LSB @ 14 bits (13-bit accuracy)
4LSB @ 12 bits (10-bit accuracy)
16LSB @ 12 bits (8-bit accuracy)
Estimated Initial Accuracy (from Step 2)
0.4% (4LSB @ 10 bits)
Not critical due to gain calibration
Not critical due to gain calibration
0.32% (3200ppm)
Estimated Tempco (from Step 2)
75ppm/°C
2ppm/°C
5ppm/°C
20ppm/°C
Reference Voltage(VREF) (from Step 1)
2.5V
2.5V
2.048V
1.25V
Minimum Reference Input Resistance from Data Sheet (RMIN)
18kΩ
18kΩ
7kΩ (14kΩ||14kΩ shared reference inputs)
18kΩ
Maximum Output Current Requirement (VREF/RMIN)
140µA max
140µA max
293µA max (dual DACs)
69µA max
Voltage-Reference Candidates (Initial Accuracy, Tempco, Output Curren
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